Abstract: Influenced by the thoughts on evil humanity of Hobbes and others, Hamilton advocated the establishment of a strong federal government after the victory of the Independent War. While he revealed the weakness of federal government, he put forward his federalism, and actively helped to bring about the convening of constitutional congress. He made an indelible contribution to the ratification of the Constitution and independence of America. Especially on the basis of absorbing thoughts of separation of three powers proposed by Locke and Montesquieu, he put forward his theory of three-power separation and balance which has contributed a lot to the stability of America for a long time, and hence has become a political prescription for governing the country.